Quote:
Originally Posted by Craig_
A normal image will have signal and noise - hopefully a favourable ratio towards the signal (SNR) but a dark has no signal, just the noise, so they will look like a frame of noise. Normal 
Spikes on one side of the frame may be amp glow. This can be calibrated out with darks. |
I think in the case, it was simply light getting in, via a tiny gap between the corrector plate and cover, all good.
I would like to know how many flats/darks make a decent sample.
I have taken flats ( tshirt ) at 30/60/180secs at LOW, MEDIUN/HIGH with the ASI during the day, cooler on, trying to get close as possible to the lights I have already taken, and camera exactly the same orientation.
Now working on the darks, as I thought, not much use imaging with a near full moon., with same parameters.
Am I wasteing my time in some ways, it takes a lot of time.
Cheers,
Lance